I reckon leave them in, really good filter feeders and will help with filtration, for free.
Also if you add something specifically to eat them, as soon as they're all gone then what does the fish eat, hoping it will take commercial foods. I have a picasso trigger which eats everthing, all tube worms, feather dusters and pods. Now when I want some shrimp to take care of my tangs I can't coz its picasso food.

Think carefully before buyig a fish you may not want a few months after.

I reckon as soon as you've got a Coral in the dusters place they'll stop coming out.

Hi Wolve,I have the same problem as you. I just end up scraping it off the sump and using a scrubbing brush to brush them off my rocks, but they always grow back. It seems they are apparently good, but don't look so good in the display. Just a word of caution
to anyone who does want, they spread like wildfire once in your tank if you don't have a predator.

they spread like wildfire once in your tank if you don't have a predator.

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yes they do, very very fast. But they are awesome food for predatory fish that have trouble accepting live food. For example, a long nose butterfly i once had, in the stages from only live food to prepared he wacked all the fan worms in my sump. My angels chowed them as well. So if you can keep them controlled in your sump they are a good food source. Maybe have them in your sump on small rocks and once in a while move them up to your display for feasting?